Electrons and Chemical Reactions STEM Case Gizmos

Unit 4 Lab Part A Electrons and Chemical Reactions STEM Case Gizmos 57 pts Please use your user name and password to login to . Then look for the Electrons and Chemical Reactions case in the list. Please put your answers in a different color than the rest of the text or lab will be returned without a grade until you do. Q1. What is your role? - Forensic scientist Q2. What evidence is found? - Copper coins, coins that look silver, and coins that look gold Handbook Q3. Make some ions. A. What is a positive ion called? Proton B. What is a negative ion called? Electron Q4. Key Concept: Atoms use their electrons to make bonds. Q5. What kind of bonds share electrons and can be represented by a ball and stick model? - Covalent bonds Q6. (2pts)When you hit the “Transfer Electron” button, what happens to the size of each atom? Why? The anion grows and the cation shrinks. Electron Transfer Q7. Key Concept: In covalent bonds, the electrons are shared. In ionic bonds, electrons are transferred to make oppositely charged ions that form the bond. Q8. Why are valence shells important? (Write at least one full sentence.) - Atoms that have a full valence shell are more stable, and stable means they are less likely to have a chemical reaction